linux-kernel - [PATCH V4 6/7] mm/mmap: Drop arch_filter

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Date:   Thu,  7 Apr 2022 16:02:50 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Christoph Hellwig <hch@...radead.org>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, sparclinux@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V4 6/7] mm/mmap: Drop arch_filter_pgprot()

There are no platforms left which subscribe ARCH_HAS_FILTER_PGPROT. Hence
drop generic arch_filter_pgprot() and also config ARCH_HAS_FILTER_PGPROT.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 mm/Kconfig | 3 ---
 mm/mmap.c  | 9 +--------
 2 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index b1f7624276f8..3f7b6d7b69df 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -762,9 +762,6 @@ config ARCH_HAS_CURRENT_STACK_POINTER
 	  register alias named "current_stack_pointer", this config can be
 	  selected.
 
-config ARCH_HAS_FILTER_PGPROT
-	bool
-
 config ARCH_HAS_VM_GET_PAGE_PROT
 	bool
 
diff --git a/mm/mmap.c b/mm/mmap.c
index 87cb2eaf7e1a..edf2a5e38f4d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -107,20 +107,13 @@ pgprot_t protection_map[16] __ro_after_init = {
 };
 
 #ifndef CONFIG_ARCH_HAS_VM_GET_PAGE_PROT
-#ifndef CONFIG_ARCH_HAS_FILTER_PGPROT
-static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
-{
-	return prot;
-}
-#endif
-
 pgprot_t vm_get_page_prot(unsigned long vm_flags)
 {
 	pgprot_t ret = __pgprot(pgprot_val(protection_map[vm_flags &
 				(VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)]) |
 			pgprot_val(arch_vm_get_page_prot(vm_flags)));
 
-	return arch_filter_pgprot(ret);
+	return ret;
 }
 EXPORT_SYMBOL(vm_get_page_prot);
 #endif	/* CONFIG_ARCH_HAS_VM_GET_PAGE_PROT */
-- 
2.25.1